expiro | b6e09d18199bceb4854be43cd24ecf00b8081a38870f733380d394210cf6a6e1

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08/01/2025, 02:16

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General

Target

JaffaCakes118_85b7c1f86d869820296791ef2d093108.exe
Size

19.5MB
MD5

85b7c1f86d869820296791ef2d093108
SHA1

ba7771ccbed4a58341548a6a0924885a9f8ab69d
SHA256

b6e09d18199bceb4854be43cd24ecf00b8081a38870f733380d394210cf6a6e1
SHA512

791387bae0c17cddbe0ffa918291a1c7f580b48a55c1db4c391bec5258f96d02cb8274f464e7bc7d9a88156d570e2608765e06b9a1c4c09ac3f9069e86ab2893
SSDEEP

393216:GmHZI2hMQdB7H/hUfaCVjTPEtOSNVW8ImMyX5/4BaPBr7rt2RqF:R1M4B7CC2AtjXImNXZ4c5kRq

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 4 IoCs

backdoor

resource	yara_rule
behavioral2/memory/4088-0-0x000000000167B000-0x000000000170E000-memory.dmp	family_expiro1
behavioral2/memory/4088-1-0x00000000002F0000-0x000000000170E000-memory.dmp	family_expiro1
behavioral2/memory/4088-2-0x000000000167B000-0x000000000170E000-memory.dmp	family_expiro1
behavioral2/memory/4088-3-0x00000000002F0000-0x000000000170E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4432	4088	WerFault.exe	81

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_85b7c1f86d869820296791ef2d093108.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_85b7c1f86d869820296791ef2d093108.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_85b7c1f86d869820296791ef2d093108.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4088
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4088 -s 372
  2⤵
  - Program crash
  PID:4432

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4088 -ip 4088
1⤵
PID:4036

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4088-0-0x000000000167B000-0x000000000170E000-memory.dmp

Filesize
588KB

Download
memory/4088-1-0x00000000002F0000-0x000000000170E000-memory.dmp

Filesize
20.1MB

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memory/4088-2-0x000000000167B000-0x000000000170E000-memory.dmp

Filesize
588KB

Download
memory/4088-3-0x00000000002F0000-0x000000000170E000-memory.dmp

Filesize
20.1MB

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